How to delete row or column in x.mat file

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shawin
shawin 2020-10-22
评论： Ameer Hamza 2020-10-22
Hi,
I have a X.mat file, its big mat file.
how can i delet the rows ( specific row ) !! for example;
row : 600 to 3000 delete
or column 25 to 35 delete
I tried The code below but did not work :
X = importdata('X.mat');
X([501,2000],:) = [];

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Ameer Hamza
Ameer Hamza 2020-10-22
编辑：Ameer Hamza 2020-10-22
Does X.mat file only have one variable? In that case, try
X(501:2000,:) = [];
%^ put : here
Also, If the variable is very large, then it may be faster to modify the mat file without loading directly
data = matfile('X.mat', 'Writable', true);
data.X(501:2000,:) = [];
  2 个评论
shawin
shawin 2020-10-22
编辑：shawin 2020-10-22
@Ameer Hamza, Cannot change 'X' because Properties.Writable is false. To modify 'X', set Properties.Writable to true. ??what properties ?? the file is 5000x64
Ameer Hamza
Ameer Hamza 2020-10-22
I missed to change the Writable property. Check the updated answer.

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